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On Tradingview, I can't open up multiple charts on one screen with the free version.
Because you need first the PRO subscription only for $9 USD per month. I don't think that is available for the free version.
I have here their blog article probably it will help you to understand, "
Multiple TradingView Charts on The Same Screen! "
For the Youtube tutorial, you may watch this it might help you too.
https://www.youtube.com/watch?v=mIUfQSMvMHY